Alarm-lock



@lo Model.) M. MIGHELS 8L J. PAULY...

v ALARM LOCK.

UNITED STATES PATENT OFFICE.

MICHEL MICHELS AND JOSEPH PAULY, OFCI-IICAGO, ILLINOIS.

ALARM-LOC K.

SPECIFICATION forming part of Letters Patent No. 459,069, dated September 8, 1891.

Application tiled February 19, 1891. Serial No. 382,029. (No model.)

T o @ZZ whom, t may concern.-

Be it known that we, MICHEL MicHELs and JOSEPH PAULY, citizens of the United States of America, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Locks, ot which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to locks, and more particularly to a secret and alarm look.

The object of the invention is to provide a lock of simple, inexpensive, and durable construction that requires a special knowledge of the manner of its operation to lock and unlock it, and one that will cause an alarm to be sounded in the locking and unlocking operations and when unauthorized persons attempt to operate it.

The invention consists in the details of construction and combinations of parts hereinafter fully described, and pointed out in the appended claims.

In the accompanying drawings, illustrating our invention, Figure l is a face view of the lock with the front plate removed and the bolt shot. Fig. 2 is a similar view with the bolt retracted, and Figs. 3 and e are vertical transverse sections illustrating in different positions the devices for securing the bolt when advanced.

Referring to said drawings, A indicates the lock-casing comprising front and rear plates a and a and the rectangular frame a2, having face-plate a3.

B indicates, as a whole, a spring-latch of familiar construction.

C indicates a sliding bolt located in an aperture in the face-plate a3 and provided with a shank C', having a slidingconneetion with guides c c, secured to the rear plate a. The said shank is provided with two shoulders c c', which are located on either side ot and engage with a transverse shaft D, (hereinafter referred to,) by means of which the extent of movement of said bolt and shank is limited.

A indicates the key-hole of the lock, and A2 a key located therein. In Fig. 2 the bolt is shown retracted with the key ready to shoot the same, and in Fig. l the bolt is shown shot and the key in the position it will assume as soon as the bolt is advanced. For the. purpose of shooting said bolt the shank is provided with a down wardly-proj ectin g shoulder C2, which is engaged and advanced by the bit of the key. Before shooting the bolt, however, the bit of the key lifts the tumbler E, that engages with a notch c3 in the upper face of the shank. The said tumbler E is carried by a spring-arm E', that serves to hold it in engagement with the notch c3. The said springarm E is secured to a pin c upon the rear plate and is provided with a downwardly-projecting finger c', located in the path of the bit of the key. After the bolt is shot and the key is turned farther it allows the finger c to descend under the influence of the spring-arm E', whereby the tumbler E willgengage with another notch C* in the shank C. The key can then be turned farther and removed. The parts of the lock will then be in the position shown in Fig. l, except that the swinging detent C2 will be in the position shown in dotted lines. If a person unacquainted with the working of the lock should try to unlock the same or retract the bolt, the key would undoubtedly be turned from left to right on top and would simply clear the shoulder C2 of the shank, lift the finger e of the spring-arm E and press back the detent C2, which is held by a spring a4, as shown in Fig. l. In turning the key as above described, however, the bit engages the lower arm f of a lever F, pivoted to the front plate a. The other arm f of this lever F engages a projection f2 on the spriug-arm F of the hammer f3, so that as the bit of the key turns the lever F on its pivot the hammer is drawn back and is then thrown against the bell F2. An alarm is thus sounded and shows that some one is attempting to retract the bolt. If the key is now turned in an opposite direction,it will pass by the detent C2 and finger c and will again engage the lower arm f of the lever and ring the bell again in an obvious manner. It will thus be seen that the key can be turned in either direction withoutmoving the bolt. A spring f4, secured to the faceplate, serves to limit the movement of the arm f of the lever on one side of the projection f2, while a spring g, secured to a post G, limits its movement on the other side.

IOO

The detent C2 is pivoted to the shank near its rear end and is the means by which the bolt is retracted. Said detent is provided on its face end Withaprojection c5. The detent is shown in dotted lines in Fig. l in the position it will assume when the bolt is shot. To retract the bolt, the key is turned in the same direction in which to shoot the bolt, but only to the position shown in Fig. l. In turning the key into this position its bit will engage the detent and carry it to the position shown in full lines, whereupon the detent will fall down until the projection c5 engages with the said bit, as shown in Fig. l. The said bit also lifts the finger e andV removes the tumbler from notch c4, so that by turning the key back the bolt will be retracted. The bit will engage the detent until the bolt is retracted, as shown in Fig. 2, said bit and detent being shown in dotted lines. Then the key is turned farther, the detent is released and is thrown against the bell F2 by the spring a4, against which it is retracted, as shown in dotted lines in Fig. 2.' The detent thus sounds an alarm and then falls back to the position shown in full lines in Fig. 2. Devices are also provided by means of which the bolt can be locked when it is shot, so that it cannot be retracted even by the key, and comprise, broadly, a locking-pin G, that engages with an opening or recess c6 in the shank C when the bolt is shot. The said locking-pin G' slides back and forth through an opening g in the post G, and is located to engage said opening or recess o6 in the shank when the bolt is shot. The rear end yof said locking-pin projects through the post G and is acted upon by a spring g2, which serves to press its other end into said recess or opening. The shaft D is supported in bearings in the front and rear plates and the post G, and carries a cam d, engaging with a iinger or projection g3 in the locking-pin, so that by turning the shaftD the locking-pin can be retracted or allowed to enter the opening c6, as shown in Figs. 3 and 4.

Gr2 indicates a spring-arm carrying a hammer g4. This said spring-arm G2 is acted upon by a wiperwheel d', mounted upon the shaft D, so that as said shaft is turned the wiper-Wheel alternately retracts and allows the hammer to strike the bell F2. By this construction an alarm will also be given when the shaft D is turned to retract the lockingpin G', so that an unauthorized person would be detected when interfering with the lock.

Ve claim as our inventionl. A lock having an alarm mechanism comprising a bell, a hammer carried bya springarm,a projection located on said spring-arm between its ends, anda pivoted lever having one arm located to engage said projection and the other arm located in the path of the bit of the key, that when the bit turns said lever on its pivot said lever will engage thel projection on the spring-arm and push back said spring-arm and then allow it to spring for- Ward and throw the hammer against the bell.

2.n A lock having an alarm mechanism comprising a bell, a hammer carried bya springarm, a projection on said arm, a pivoted'lever having one arm located to engage said projection` and the other arm located in the path of the bit of the key, and springs g4 and f4, engaging said lever and serving to hold it in engagement with the said projection.

3. A lock comprising a bolt, a detent pivoted thereto and located in the path of the bit of the key, and a spring acting upon said detent and serving to throw it against a bell or similar alarm mechanism.

4f. A lock comprising a bolt, a locking-pin, a shaft having a cam engaging and operating said pin, a wiper-Wheel on said shaft, and a spring-arm located in engagement with said wiper-Wheel, said spring-arm carrying a ham mer which sounds an alarm.

5. A lock comprising a bolt having a shank provided with shoulders c', a locking-pin for holding said bolt immovable, a shaft for operating said locking pin, sai-d shaft being mounted .in bearings on the lock-casing' and located between said shoulders on the shank to limit the movement of said bolt in. being retracted and being shot.

6. A lock comprisinga bolt, a post G, located adjacent thereto, alocking-pin upon said post, a spring g2, engaging said locking-pin, a lug upon said locking-pin, and a cam engaging said lug and carried by a shaft located in IOO 

